Wood vs Gas vs Electric Fireplace Cost Calculator

Introduction: Comparing Wood, Gas, and Electric Fireplace Costs

This fireplace comparison estimates the seasonal operating cost of wood, gas, and electric units. Enter the heat you expect from a wood or gas fireplace, seasonal run time, and local fuel prices; for electric, enter the heater's rated power draw and your electricity price.

Use this fireplace cost comparison when you are:

• Choosing between installing a wood, gas, or electric fireplace
• Deciding whether to keep using your current fireplace or switch to another type
• Comparing the cost to run your fireplace to other heating options

Inputs the Fireplace Cost Calculator Uses

This wood, gas, and electric fireplace comparison uses practical usage, fuel, and appliance inputs that you can usually estimate or find on a bill or product label:

• Heat Needed (BTU/hour) – How much supplemental heat you want the wood or gas fireplace to provide on average while it is running.
• Hours of Use per Season – Total hours you expect to run the fireplace during the heating season.
• Wood Cost per Cord ($) – Your local price for a full cord of firewood.
• BTU per Cord – The energy content of your wood. Typical seasoned firewood ranges from about 16 to 24 million BTU per cord.
• Gas Price per Therm ($) – Your natural gas or propane rate per therm (1 therm = 100,000 BTU).
• Gas Fireplace Efficiency (%) – How efficiently your gas fireplace converts fuel into usable heat. You can often find this in the product manual or on the manufacturer’s website.
• Electric Fireplace Power (kW) – The rated power draw of your electric fireplace when heating.
• Electricity Rate ($/kWh) – Your electricity price per kilowatt-hour from your utility bill.

Formulas Used for Wood, Gas, and Electric Fireplace Costs

For wood and gas, the calculator estimates seasonal heat demand from the BTU/hour setting and run time, then converts that heat into fuel use and cost. The electric estimate instead uses the electric fireplace’s rated kW draw and its seasonal operating hours.

1. Total Seasonal Heat Requirement for Wood and Gas

For the wood and gas fireplace estimates, let:

• B_t = heat needed per hour in BTU/hour
• h = hours of use per season

The total seasonal heat requirement H is:

For the wood and gas portions of this fireplace comparison, H is measured in BTU per season.

2. Wood Fireplace Operating Cost

The wood fireplace estimate converts the seasonal heat requirement into cords using the BTU content you entered. Let:

• B_c = BTU per cord of wood
• P_c = price per cord of wood in dollars

Cords of wood required:

cords = H ÷ B_c

Seasonal wood cost C_w:

C_w = (H ÷ B_c) × P_c

3. Gas Fireplace Operating Cost

The gas fireplace estimate converts useful seasonal heat into the therms needed after accounting for the efficiency setting. Gas is measured in therms, where 1 therm = 100,000 BTU. Let:

• P_t = price per therm of gas in dollars
• η = gas fireplace efficiency (for example, 80% efficiency = 0.80)

First, adjust for efficiency: the burner must produce more BTU than you receive as useful heat. Effective fuel BTU required is H ÷ η.

Therms required:

therms = (H ÷ η) ÷ 100,000

Seasonal gas cost C_g:

C_g = ((H ÷ η) ÷ 100,000) × P_t

4. Electric Fireplace Operating Cost

The electric fireplace estimate is based on the unit’s rated heating power and the hours it runs; it does not convert the BTU/hour heat-needed input into electric consumption. Let:

• P_e = electric fireplace power in kW
• R_e = electricity rate in $/kWh
• h = hours of use per season

Seasonal electricity use in kWh:

kWh = P_e × h

Seasonal electric cost C_e:

C_e = P_e × h × R_e

Worked Example: Seasonal Fireplace Operating Costs

This worked fireplace comparison uses the defaults shown in the calculator to illustrate how each seasonal operating cost is obtained:

• Heat Needed: 20,000 BTU/hour
• Hours of Use: 200 hours per season
• Wood Cost: $300 per cord
• BTU per Cord: 20,000,000 BTU
• Gas Price: $1.50 per therm
• Gas Fireplace Efficiency: 80%
• Electric Fireplace Power: 1.5 kW
• Electricity Rate: $0.13 per kWh

Step 1: Fireplace Heat Requirement

For the wood and gas fireplace calculations:

H = 20,000 BTU/hour × 200 hours = 4,000,000 BTU

Step 2: Wood Fireplace Cost

For the wood fireplace:

Cords required:

cords = 4,000,000 ÷ 20,000,000 = 0.2 cords

Seasonal wood cost:

C_w = 0.2 × $300 = $60

Step 3: Gas Fireplace Cost

For the gas fireplace:

Adjust for efficiency:

Effective BTU needed from gas = 4,000,000 ÷ 0.80 = 5,000,000 BTU

Therms required:

therms = 5,000,000 ÷ 100,000 = 50 therms

Seasonal gas cost:

C_g = 50 × $1.50 = $75

Step 4: Electric Fireplace Cost

For the electric fireplace’s rated 1.5 kW draw:

Energy use:

kWh = 1.5 kW × 200 hours = 300 kWh

Seasonal electric cost:

C_e = 300 × $0.13 = $39

Example Summary of Fireplace Costs

With these inputs, the electric unit has the lowest estimated operating cost, followed by wood and then gas. This is a cost comparison of the entered appliances and usage assumptions; verify that the electric unit’s kW rating provides the level of heat you want before treating the three options as equivalent.

Interpreting Your Fireplace Cost Results

After you estimate fireplace costs, the calculator displays separate seasonal dollar amounts for wood, gas, and electric operation under the inputs you supplied.

To evaluate the fireplace cost results:

• Look at which fireplace type has the lowest seasonal cost. This is the least expensive option to run under your assumptions.
• Compare the dollar gap between options. That difference is the seasonal saving associated with the inputs, rather than a guaranteed saving for every home.
• For electric, confirm that the rated kW input represents the heater setting and heat output you intend to use. The electric result is based on power draw and hours, not the BTU/hour heat-needed entry.
• Consider installation cost, comfort, maintenance, and the way each fireplace heats the room alongside the seasonal operating estimate.

Comparison of Wood, Gas, and Electric Fireplace Tradeoffs

Beyond the seasonal figures calculated above, choosing a wood, gas, or electric fireplace involves practical differences in fuel handling, installation, and maintenance.

Assumptions and Limitations of the Fireplace Cost Comparison

This fireplace cost calculator provides transparent seasonal operating estimates rather than a complete installation, performance, or safety assessment. Important assumptions and limitations include:

• Operating costs only: The tool compares fuel and electricity use. It does not include installation, permits, venting changes, chimney liners, or equipment purchase costs.
• Wood BTU content: The “BTU per cord” value is an approximation. Real-world values depend on species, density, and moisture content. Wet or unseasoned wood can provide far fewer BTU per cord than dry hardwood.
• Wood conversion: The wood calculation divides the entered seasonal heat requirement by BTU per cord and does not apply a separate wood-fireplace efficiency factor.
• Efficiency inputs: Gas fireplace efficiency can vary widely. Always use values from the manufacturer when possible. Actual efficiency may also vary with venting, maintenance, and how you operate the unit.
• Electric power input: The electric calculation uses rated kW multiplied by seasonal hours and the electricity rate. It does not adjust electric use to match the heat-needed BTU/hour value, so comparing options fairly requires choosing an electric unit and operating pattern appropriate to the heating task.
• Fuel price volatility: Wood, gas, and electricity prices can change rapidly by season and region. For reliable comparisons, update your prices regularly using your latest bills or supplier quotes.
• Space heating context: The BTU/hour value you enter is treated as additional heat delivered directly to the living space. It does not account for how your central heating system may respond (for example, how much it turns down when the fireplace runs).
• Simplified usage pattern: The calculator multiplies a single BTU/hour value by a total number of hours for wood and gas, and a single kW rating by total hours for electric. It does not model day-by-day weather, thermostat schedules, or varying fireplace output levels.
• No safety or code evaluation: Results do not consider building codes, clearance requirements, ventilation, carbon monoxide risks, or any other safety regulations. Always consult qualified professionals before installing or modifying a fireplace.
• No environmental or health advice: Emissions, indoor air quality, and health impacts are not quantified. Local rules may restrict certain fireplace types or fuel uses.

This fireplace operating-cost comparison is for informational and educational purposes only and is not a substitute for professional energy, installation, or safety advice.